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Update watch(1) to handle more accurate intervals

This commit is contained in:
sin 2014-11-30 14:03:25 +00:00
parent 4cb108f557
commit 703e18185c
1 changed files with 10 additions and 4 deletions
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14
watch.c
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@ -1,4 +1,5 @@
/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -15,14 +16,19 @@ int
main(int argc, char *argv[])
{
char cmd[BUFSIZ];
int i, interval = 2;
char *end;
useconds_t interval = 2 * 1E6;
float period;
int i;
ARGBEGIN {
case 't':
break;
case 'n':
/* Only whole seconds for now */
interval = estrtol(EARGF(usage()), 10);
period = strtof(EARGF(usage()), &end);
if (*end != '\0' || errno != 0)
eprintf("invalid interval\n");
interval = period * 1E6;
break;
default:
usage();
@ -44,7 +50,7 @@ main(int argc, char *argv[])
printf("\x1b[2J\x1b[H"); /* clear */
fflush(NULL);
system(cmd);
sleep(interval);
usleep(interval);
}
return 0;
}